Backlight assembly with improved strength and display device having the same

ABSTRACT

A backlight assembly having improved strength and a display device having the backlight assembly are provided. The backlight assembly includes a light source supplying light and a fixing member receiving the light source. A deflection preventing portion having a predetermined width is formed on a surface of the fixing member in a direction crossing a diagonal on the surface of the fixing member.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.11/219,161, filed Sep. 2, 2005 now U.S. Pat. No. 7,217,027, which claimspriority to Korean Patent Application No. 2004-0070339 filed on Sep. 3,2004, the contents of which are herein incorporated by reference intheir entirety.

BACKGROUND OF THE INVENTION

(a) Technical Field

The present disclosure relates to a backlight assembly having improvedstrength and a display device having the backlight assembly, and moreparticularly to a backlight assembly in which strength of a fixingmember is improved by forming beads on a surface of the fixing memberand a display device having the backlight assembly.

(b) Discussion of the Related Art

There has been increased demand for small and light display devices withbetter performance, due to, at least in part, further development ofsemiconductor technologies.

Among such display devices, a liquid crystal display (LCD) has smallsize, small weight, and low power consumption. As a result, liquidcrystal display devices have been used as a substitute for the existingcathode ray tubes (CRTs). LCDs are used for almost all informationprocessing apparatuses which require a display device.

In a liquid crystal display device, a specific molecular alignment ofliquid crystal cells is changed into another molecular alignment byapplying a voltage, and a change in optical characteristics of liquidcrystal cells, such as birefringence, optical rotary power, dichroism,and optical scattering, is converted into a visual change. That is,information is displayed by using the optical modulation of the liquidcrystal cells.

The display devices, such as liquid crystal display devices, are appliedto digital televisions having a large size. The display devices appliedto such large-sized products have very small thickness when comparedwith their areas. As a result, the large display devices are sensitiveto external impacts.

Methods for improving a structure of a display device are needed toaddress the sensitivity to impact. For example, in the display devicewith increased size, strength reinforcement in the diagonal direction,as well as strength reinforcement in the horizontal and verticaldirections is desired to prevent twisting of the display device.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a backlight assembly inwhich strength is improved to prevent twisting in the diagonal directionand a display device having the backlight assembly.

The backlight assembly according to an embodiment of the presentinvention includes a light source supplying light, and a fixing memberreceiving the light source. A deflection preventing portion having apredetermined width is formed on a surface of the fixing member in adirection crossing a diagonal on the surface of the fixing member.

The deflection preventing portion preferably has a first deflectionpreventing portion which is formed in a direction crossing a firstdiagonal on the bottom surface of the fixing member; and a seconddeflection preventing portion which is formed in a direction crossing asecond diagonal on the bottom surface of the fixing member.

A plurality of first deflection preventing portions and a plurality ofsecond deflection preventing portions are preferably formed to bealternately connected in the upper half area and the lower half area onthe bottom surface of the fixing member.

Preferably, the deflection preventing portions formed in the upper halfarea on the bottom surface of the fixing member are symmetrical to thedeflection preventing portions formed in the lower half area.

Connecting portions for connecting joints between the first deflectionpreventing portions and the second deflection preventing portions may beformed on the bottom surface of the fixing member to have apredetermined width.

The connecting portions are preferably formed by pressing the fixingmember.

A plurality of connecting portions may be formed parallel to each other.

Preferably, the backlight assembly according to an embodiment of thepresent invention also includes a reflecting sheet which is locatedadjacent to the bottom surface of the fixing member and the connectingportions are protruded toward the reflecting sheet.

The plurality of first deflection preventing portions may be formedparallel to each other.

The plurality of second deflection preventing portions may be formedparallel to each other.

The first deflection preventing portions are preferably formed to extendto at least one corner of both corners in a direction of the seconddiagonal direction.

The second deflection preventing portions may cross the second diagonal,and may be connected to the first deflection preventing portions.

The second deflection preventing portions are preferably formed toextend to at least one corner of both corners in a direction of thefirst diagonal.

The first deflection preventing portions may cross the first diagonal,and may be connected to the second deflection preventing portions.

The number of first deflection preventing portions may be 4, 6, or 8.

The number of second deflection preventing portions may be 4, 6, or 8.

Preferably, an angle α, which the deflection preventing portion formswith respect to the diagonal of the bottom surface of the fixing member,satisfies the expression arctan(W/L)<α<90°,

where, W denotes the width of the bottom surface of the fixing memberand L denotes the length of the bottom surface of the fixing member.

The deflection preventing portion may be protruded toward the reflectingsheet.

Preferably, the light source includes a plurality of lamps, and theplurality of lamps are received adjacent each other in a line by thefixing member.

The deflection preventing portion may be formed by pressing the fixingmember.

A display device according to an embodiment of the present inventionincludes a panel unit displaying an image, a light source supplyinglight to the panel unit, and a fixing member receiving the light source.A deflection preventing portion is formed on a surface of the in adirection crossing a diagonal on the surface of the fixing member.

The deflection preventing portion may include a first deflectionpreventing portion which is formed in a direction crossing a firstdiagonal on the bottom surface of the fixing member, and a seconddeflection preventing portion which is formed in a direction crossing asecond diagonal on the bottom surface of the fixing member.

Preferably, a plurality of first deflection preventing portions and aplurality of second deflection preventing portions are formed to bealternately connected in the upper half area and the lower half area onthe bottom surface of the fixing member.

Preferably, connecting portions for connecting joints between the firstdeflection preventing portions and the second deflection preventingportions are formed on the bottom surface of the fixing member to have apredetermined width.

The display device according to an embodiment of the present inventionmay also include a reflecting sheet which is located adjacent to thebottom surface of the fixing member. The connecting portions may beprotruded toward the reflecting sheet.

The first deflection preventing portions may be formed to extend to atleast one corner of both corners in a direction of the second diagonal.

The second deflection preventing portions may cross the second diagonal,and may be connected to the first deflection preventing portions.

The second deflection preventing portions may be formed to extend to atleast one corner of both corners in a direction of the first diagonal.

The first deflection preventing portions may cross the first diagonal anmay be connected to the second deflection preventing portions.

Preferably, an angle α, which the deflection preventing portion formswith respect to the diagonal of the bottom surface of the fixing membersatisfies the expression arctan(W/L)<α<90°,

where, W denotes the width of the bottom surface of the fixing memberand L denotes the length of the bottom surface of the fixing member.

The deflection preventing portion is preferably protruded toward thereflecting sheet.

The light source has a plurality of lamps, and the plurality of lampsare preferably received adjacent each other in a line by the fixingmember.

The panel unit may be a liquid crystal display panel.

BRIEF DESCRIPTION OF THE DRAWINGS

Preferred embodiments of the present invention can be understood in moredetail from the following descriptions taken in conjunction the attacheddrawings in which:

FIG. 1 is an exploded perspective view illustrating a display devicehaving a backlight assembly according to an embodiment of the presentinvention;

FIG. 2A is a rear perspective view illustrating a backlight assemblyaccording to an embodiment of the present invention;

FIG. 2B is a cross-sectional view of the fixing member and thereflecting sheet taken along the line AA or BB in FIG. 2A, according toan embodiment of the present invention;

FIG. 3 is a rear perspective view illustrating a fixing member providedin a backlight assembly according to an embodiment of the presentinvention;

FIG. 4 is a plan view illustrating the fixing member shown in FIG. 3;

FIG. 5 is a rear perspective view illustrating a fixing member providedin a backlight assembly according to an embodiment of the presentinvention;

FIG. 6 is a rear perspective view illustrating a fixing member providedin a backlight assembly according to an embodiment of the presentinvention; and

FIGS. 7A to 7D are perspective views illustrating bottom chassesaccording to comparative examples 1 to 4, respectively.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Preferred embodiments of the present invention will now be describedmore fully hereinafter below in more detail with reference to theaccompanying drawings, in which preferred embodiments of the inventionare shown. This invention may, however, be embodied in different formsand should not be construed as limited to the embodiments set forthherein.

FIG. 1 shows a direct type display device 100 which may be used for alarge-sized television, for example.

The display device 100 includes a panel unit 50 on which an image isdisplayed and a backlight assembly 70 for supplying light to the panelunit 50. The panel unit 50 is fixed on the backlight assembly 70 by atop chassis 60. The top chassis 60 can be made of for example, a resinor a metal.

It is to be understood that, although an LCD panel unit is shown as thepanel unit 50, the present invention is not limited thereto.

A panel assembly 40 includes the panel unit 50, driver integratedcircuit packages 43 and 44, and printed circuit boards (“PCBs”) 41 and42. A plurality of driver integrated circuit packages 43 and 44 areelectrically connected to gate lines and data lines formed on the panelunit 50, respectively. The driver integrated circuit packages can be COF(Chip On Film) types, tape carrier packages, or the like.

The panel unit 50 comprises a TFT (Thin Film Transistor) panel 51including a plurality of thin film transistors, a color filter panel 53disposed over the TFT panel 51, and liquid crystal (not shown)interposed between the two panels 51, 53.

The TET panel 51 is a transparent glass panel in which a plurality ofthin film transistors are formed in a matrix shape. Source terminalsformed on the TFT panel 51 are connected to the data lines, and gateterminals formed thereon are connected to the gate lines. In addition,pixel electrodes including transparent ITO (indium tin oxide), which isa conductive material, are formed in drain terminals.

The data lines and the gate lines of the panel unit 50 are connected tothe driver integrated circuit packages 44 and 43, respectively. Ifelectrical signals from the data PCB 42 are input to the sourceterminals and electrical signals from the gate PCB 41 are input to thegate terminals, the thin film transistors are turned on or off dependingupon the electrical signals, and electrical signals necessary to form animage are output to the drain terminals. A control board (not shown)electrically connected to the data PCB 42 takes driving signals from theoutside and applies the driving signals to the data lines and the gatelines of the panel unit 50.

Meanwhile, the color filter panel 53 is arranged on the TFT panel 51 sothat TFT and color filter panels 51, 53 are opposed to each other. Thecolor filter panel 53 is a panel on which RGB pixels for displayingvarious colors by transmitting light are formed. A common electrodeincluding ITO is formed on the surface of the color filter panel 53. Ifa driving voltage is applied to the gate terminals and the sourceterminals of the thin film transistors in order to turn on the thin filmtransistors, an electric field is formed between the pixel electrodesand the common electrode of the color filter panel 53. An alignmentangle of the liquid crystal molecules interposed between the TFT panel51 and the color fitter panel 53 is changed due to the electric fieldand light transmittance is changed in accordance with the changedalignment angle, thereby obtaining a desirable image.

The gate PCB 41 supplies gate driving signals to the panel unit 50through the gate driver integrated circuit package 43. The data PCB 42supplies data driving signals to the panel unit 50 through the datadriver integrated circuit package 44.

A backlight assembly 70 is disposed below the panel unit assembly 40 touniformly supply light to the panel unit 50 displaying an image. Thebacklight assembly 70 includes a light source 76 supplying tight to thepanel unit 50. A plurality of light sources 76 are received in a fixingmember 10. Although a plurality of lamps are shown in FIG. 1, otherlight sources, such as a linear light source and a planar light sourcemay be used instead of the lamps.

The backlight assembly 70 includes the light sources 76, a reflectingsheet 79, light source holders 78, a diffusing plate 74, and opticalsheets 72. These elements are received by the fixing member 10 and arefixed by a mold frame 62. The fixing member 10 can be made of, forexample, a metal or a resin.

The light sources 76 are disposed to be spaced by a predetermined gapfrom each other. The light source holders 78 are disposed at both endsof the light sources 76 to fix the light sources 76. The reflectingsheet 79 reflects the light emitted from the light sources 76. Thediffusing plate 74 uniformly diffuses the light emitted from the lightsources 76. The optical sheets 72 enhance the brightness of light andsupply the light to the panel unit 50.

The bottom or rear surface of the fixing member 10 is provided with aninverter 46 (see FIG. 2A) and a control board (not shown). The inverter46 is covered and protected with a shield case 64. Lamp wires 761,connected to the light sources 76, are electrically connected to theinverter 46 by using sockets 77.

The inverter 46 transforms an external voltage into a constant voltagelevel and supplies the constant voltage to the light sources 76 to drivethe light sources 76. The control board is connected to the data PCB 42and supplies the driving signals to the panel unit 50.

The bottom surface of the fixing member 10 of the display device 100 isdeformed when pressure is applied to the bottom surface of the fixingmember 10. Accordingly, it is possible to provide a display device inwhich twisting at the time of carrying and transferring is prevented.

The structure of the bottom surface of the fixing member 10 is describedwith reference to FIGS. 2 to 4.

FIG. 2A shows the rear surface of the backlight assembly 70 shown inFIG. 1, wherein the fixing member 10 is shown as part of the backlightassembly 70 in the assembled state.

A plurality of deflection preventing portions 1011 and 1013 and aplurality of connecting portions 1015 having predetermined widths, suchthat the deflection preventing and connecting portions enhance thestrength of the fixing member 10, are formed on the bottom surface 12 ofthe fixing member 10. As a result, the strength of the fixing member 10can be enhanced to prevent twisting when, for example, carrying thedevice. The deflection preventing portions 1011 and 1013 are formed indirections crossing the diagonal directions of the bottom surface 12 inorder to prevent twisting of the fixing member 10. The diagonaldirections are directions which cross the X axis direction and the Yaxis direction in FIG. 2A.

The connecting portions 1015 are formed on the bottom surface 12 of thefixing member 10 to mutually connect joints between the first deflectionpreventing portions 1011 and the second deflection preventing portions1013. The connecting portions 1015 extend in the Y axis direction.

A cross-section of the fixing member 10 and the reflecting sheet 79taken along Line AA or Line BB is shown in the enlarged circle of FIG.2B. Line AA cuts the connecting portions 1015 and Line BB cuts the firstdeflection preventing portions 1013. As shown in the enlarged circle ofFIG. 2B, the fixing member 10 is protruded toward the reflecting sheet79. Since the fixing member 10 is formed to be protruded toward thereflecting sheet 79, the inverter 46 can be easily mounted on the bottomsurface 12 of the fixing member 10, The reflecting sheet 79 is made of arelatively hard plate and can be disposed on the fixing member 10.

The deflection preventing portions 1011 and 1013 and the connectingportions 1015 have predetermined widths, such that the deflectionpreventing and connecting portions enhance the strength of the fixingmember 10 to prevent twisting. Therefore, the deflection preventingportions 1011 and 1013 and the connecting portions 1015 enhance thestrength of the backlight assembly 70 applied to, for example, alarge-sized apparatus, such as a television. That is, the increase insize of a display device causes concentration of stress in both diagonaldirections to twist the display device. However, by forming thedeflection preventing portions 1011 and 1013 and the connecting portions1015 having a large enough width in the fixing member, twist can beprevented. The deflection preventing portions 1011 and 1013 and theconnecting portions 1015 can be formed without forming protrusions.

The structure of the fixing member 10 is further described withreference to FIGS. 3 and 4.

FIG. 3 shows a fixing member 10 which is separated from the backlightassembly 70 shown in FIG. 2A. A plurality of first deflection preventingportions 1011 are formed parallel to each other and a plurality ofsecond deflection preventing portions 1013 are also formed parallel toeach other. Accordingly, when an external force capable of causing twistof the bottom surface 12 of the fixing member 10 acts, the firstdeflection preventing portions 1011 and the second deflection preventingportions 1013 provide a constant resistance to the external force.Therefore, the strength of the fixing member 10 is enhanced to preventtwist of the fixing member 10.

The first deflection preventing portions 1011 and the second deflectionpreventing portions 1013 are formed in at upper and lower areas, alongthe y-axis, of the bottom surface 12 to be alternately connected. Sincethe first deflection preventing portions 1011 and the second deflectionpreventing portions 1013 are alternately connected, the strength of thefixing member 10 is enhanced.

The number of first deflection preventing portions 1011 formed on thebottom surface 12 of the fixing member 10 is 6. Three first deflectionpreventing portions 1011 are formed in the upper area of the bottomsurface 12, with respect to the y-axis, and three first deflectionpreventing portions 1011 are formed in the lower area of the bottomsurface 12, with respect to the y-axis. Similarly, 6 second deflectionpreventing portions 1013 are formed on the bottom surface 12 of thefixing member 10, 3 in the upper area and 3 in the lower area, A smallnumber of deflection preventing portions 1011 and 1013 and connectingportions 1015 on the bottom surface 12, may provide the desired strengthof the fixing member 10. The deflection preventing portions 1011 and1013 and the connecting portions 1015 may be formed in, for example, abead shape or a stiffener shape.

As shown in FIG. 4, the first deflection preventing portions 1011 areformed in the direction crossing a first diagonal direction (indicatedby the single-dotted line) connecting the left upper corner and theright lower corner of the fixing member 10 (left and right and upper andlower being relative to the x-axis and y-axis, respectively, shown inFIG. 4). The second deflection preventing portions 1013 are formed inthe direction crossing a second diagonal direction (indicated by thedouble-dotted line) connecting the right upper corner and the left lowercorner of the fixing member 10. When the fixing member 10 has a largearea, twist can be generated in the first diagonal direction and thesecond diagonal direction. Therefore, by forming the first deflectionpreventing portions 1011 and the second deflection preventing portions1013 in directions crossing both diagonal directions, twist of thefixing member 10 is prevented.

The deflection preventing portions 1011 and 1013 formed in the upperarea of the bottom surface 12 of the fixing member 10 are symmetricalwith the deflection preventing portions 1011 and 1013 formed in thelower area of the bottom surface 12 of the fixing member 10. As aresult, the deflection preventing portions 1011 and 1013 can be formedby machining the fixing member 10 by press machining or the like. Also,since the connecting portions 1015 are parallel to each other, theformation thereof is facilitated.

Among a plurality of first deflection preventing portions, the firstdeflection preventing portions 1011 formed at the right upper corner andthe left lower corner extend to both corners in the second diagonaldirection (indicated by the double-dotted line) of the bottom surface 12of the fixing member 10. Alternatively, the first deflection preventingportions 1011 may extend to one corner in the second diagonal direction.

The second deflection preventing portions 1013 connected to the firstdeflection preventing portions 1011 cross the second diagonal direction,thereby preventing twist of the fixing member 10. Among a plurality ofsecond deflection preventing portions, the second deflection preventingportions 1013 formed at the left upper corner and the right lower cornerextend to both corners in the first diagonal direction (indicated by thesingle-dotted line) of the bottom surface 12 of the fixing member 10.Alternatively, the second deflection preventing portions 1013 may extendto one corner in the first diagonal direction. The first deflectionpreventing portions 1011 connected to the second deflection preventingportions 1013 cross the first diagonal direction, thereby improving thestrength of the fixing member 10.

The deflection preventing portions 1011 and 1013 form an angle α aboutthe first diagonal direction and the second diagonal direction of thebottom surface 12 of the fixing member 10. The angle α preferablysatisfies the following Expression:arctan(W/L)<α<90°

where, W denotes the width (Y axis direction) of the bottom surface 12of the fixing member 10 and L denotes the length (X axis direction) ofthe bottom surface 12 of the fixing member 10.

In the above Expression, arctan(W/L) should be greater than 0 in orderto form the deflection preventing portions 1011 and 1013 in the diagonaldirections and to prevent twist of the fixing member 10. Further, αshould be an acute angle, that is, less than 90°. By forming thedeflection preventing portions 1011 and 1013 having the above-mentionedangle range, it is possible to efficiently prevent twisting of thefixing member 10.

FIG. 5 shows a fixing member 20 provided in a backlight assemblyaccording to an embodiment of the present invention. First deflectionpreventing portions 2011 and second deflection preventing portions 2013are formed on the bottom surface 22 of the fixing member 20. Jointsbetween the first deflection preventing portions 2011 and the seconddeflection preventing portions 2013 are mutually connected throughconnecting portions 2015.

The structure of the fixing member 20 is similar to that of the fixingmember 10 shown in FIG. 4, except for the number of deflectionpreventing portions 2011 and 2013 and the number of connecting portions2015.

Four first deflection preventing portions 2011 and four seconddeflection preventing portions 2013 are formed on the bottom surface 22of the fixing member 20. The desired strength of the fixing member iscapable of being achieved with this number of deflection preventingportions 2011 and 2013 and the corresponding connecting portions 2015formed on the bottom surface 22 of the fixing member 20.

FIG. 6 shows a fixing member 30 provided in a backlight assemblyaccording to an embodiment of the present invention. First deflectionpreventing portions 3011 and second deflection preventing portions 3013are formed on the bottom surface 32 of the fixing member 30. Jointsbetween the first deflection preventing portions 3011 and the seconddeflection preventing portions 3013 are mutually connected throughconnecting portions 3015.

The structure of the fixing member 30 is similar to that of the fixingmember 10 shown in FIG. 4, except for the number of deflectionpreventing portions 3011 and 3013 and the number of connecting portions3015.

Eight first deflection preventing portions 3011 and eight seconddeflection preventing portions 3013 are formed on the bottom surface 32of the fixing member 30. By forming a proper number of deflectionpreventing portions 3011 and 3013 and a proper number of connectingportions 3015 on the bottom surface 32 of the fixing member 30, it ispossible to achieve the desired strength of the fixing member 30.

Hereinafter, the embodiments of the present invention are described inmore detail with reference to an experimental example.

The fixing member provided in the backlight assembly shown in FIGS. 1-4and conventional fixing members are now compared with respect to degreeof twist by using a simulation thereof.

FIGS. 7A to 7D schematically illustrate the shapes of the fixing membersaccording to comparative examples 1 to 4, respectively. In thecomparative examples, no bead is formed on the fixing member or beadsare only formed in the longitudinal direction or the lateral directionof the fixing member. The degrees of twist of the fixing memberaccording to the experimental example and of the fixing membersaccording to the comparative examples are measured as follows.

A uniform pressure of 100 Pa is applied to the respective fixing membershaving the same size, but different shapes. Next, one corner of thefixing member is fixed and the opposite corner is lifted by about 50 mm.At this time, by measuring the maximum sinking amount of the other twocorners, the degree of twist of the fixing member is obtained.

COMPARATIVE EXAMPLE 1

As shown in FIG. 7A, a fixing member 80 without a bead is prepared. Byfixing Point E and lifting Point B by about 50 mm, the maximum sinkinglength at Point D is measured.

COMPARATIVE EXAMPLE 2

As shown in FIG. 76, a fixing member 85 on which only one bead 851 isformed in the X axis direction is prepared. By fixing Point E andlifting Point B by about 50 mm, the maximum sinking length at Point D ismeasured.

COMPARATIVE EXAMPLE 3

As shown in FIG. 7C a fixing member 90 on which two beads 901 are formedin the X axis direction is prepared. By fixing Point E and lifting PointB by about 50 mm, the maximum sinking length at Point D is measured.

COMPARATIVE EXAMPLE 4

As shown in FIG. 7D, a fixing member 95 on which three beads 951 areformed in the Y axis direction is prepared. By fixing Point E andlifting Point B by about 50 mm, the maximum sinking length at Point D ismeasured.

EXPERIMENTAL EXAMPLE 1

A fixing member on which the deflection preventing portions and theconnecting portions are formed as shown in FIGS. 1-4 is prepared.Similar to comparative examples 1 to 4 described above, by fixing PointE and lifting Point B by about 50 mm, the maximum sinking length atPoint D is measured.

The maximum sinking lengths measured in comparative examples 1 to 4andexperimental example 1 are shown in Table 1 for the purpose of mutualcomparison.

TABLE 1 Maximum Comparison of sinking length sinking length Experimentalexample 1 14.7 mm 100% Comparative example 1 103.0 mm  701% Comparativeexample 2 95.0 mm 646% Comparative example 3 86.6 mm 589% Comparativeexample 4 88.9 mm 605%

The comparison of sinking length in Table 1 represents ratios of themaximum sinking length according to comparative examples 1 to 4 to themaximum sinking length according to experimental example 1.

The comparative example 1 has a maximum sinking length of 103.0 mm,which means that the sinking degree of comparative example 1 is about 7times the sinking degree of experimental example 1. Therefore, when anexternal pressure acts on the fixing member 80, the fixing member 80 istwisted to a considerable extent.

The comparative example 2 has a maximum sinking length of 95.0 mm, whichis less than that of comparative example 1, but the sinking degree ofcomparative example 2 is about 6.5 times the sinking degree ofexperimental example 1. Therefore, when an external pressure acts on thefixing member 85, the fixing member 85 is twisted to a considerableextent.

The comparative example 3 has a maximum sinking length of 86.6 mm, whichis less than comparative example 2, but the sinking degree ofcomparative example 3 is about 5.9 times the sinking degree ofexperimental example 1. Therefore, when an external pressure acts on thefixing member 90, the fixing member 90 is twisted to a considerableextent.

The comparative example 4 has a maximum sinking length of 88.9 mm, whichis greater than that of comparative example 3. The sinking degree ofcomparative example 4 is about 6.1 times that of experimental example 1.Therefore, when an external pressure acts on the fixing member 95, thefixing member 95 is twisted to a considerable extent.

The maximum sinking length of the fixing member according toexperimental example 1 is 14.7 mm, which is much less than those ofcomparative examples 1 to 4.

It can be seen from experimental example 1 that the fixing memberaccording to an embodiment of the present invention has strength enoughto resist twist.

Although the exemplary embodiments of the present invention have beendescribed herein with reference to the accompanying drawings, it is tobe that the present invention is not limited to those preciseembodiments, and that various other changes and modifications may beaffected therein by one of ordinary skill in the related art withoutdeparting from the spirit and scope of the invention. All such changesand modifications are intended to be included within the scope of theinvention as defined by the appended claims.

1. A backlight assembly comprising: a light source; and a fixing memberreceiving the light source having at least one deflection preventingportion that has a predetermined width and is integrally formed with asurface of the fixing member in a direction crossing a diagonal of thesurface of the fixing member, wherein the deflection preventing portionis formed by making unevenness in the surface.
 2. The backlight assemblyof claim 1, wherein the at least one deflection preventing portioncomprises a plurality of deflection preventing portions and wherein theplurality of deflection preventing portions includes: at least one firstdeflection preventing portion formed on the surface of the fixing memberin a direction crossing a first diagonal of the surface of the fixingmember; and at least one second deflection preventing portion formed onthe surface of the fixing member in a direction crossing a seconddiagonal of the surface of the fixing member.
 3. The backlight assemblyof claim 2, wherein the at least one first deflection preventing portioncomprises a plurality of first deflection preventing portions and the atleast second deflection preventing portion comprises a plurality ofsecond deflection preventing portions, and wherein the plurality offirst deflection preventing portions and the plurality of seconddeflection preventing portions are formed to be alternately connected inan upper half area and a lower half area on the surface of the fixingmember.
 4. The backlight assembly of claim 3, wherein the deflectionpreventing portions formed in the upper half area are symmetrical to thedeflection preventing portions formed in the lower half area.
 5. Thebacklight assembly of claim 3, wherein at least one connecting portionfor connecting the first deflection preventing portions and the seconddeflection preventing portions is formed on the surface of the fixingmember.
 6. The backlight assembly of claim 5, wherein the at least oneconnecting portion is formed by pressing the fixing member.
 7. Thebacklight assembly of claim 5, wherein the at least one connectingportion comprises a plurality of the connecting portions and wherein theplurality of connecting portions are formed to be parallel to eachother.
 8. The backlight assembly of claim 5, further comprising areflecting sheet located to be adjacent to the surface of the fixingmember, wherein the at least one connecting portion is protruded towardthe reflecting sheet.
 9. The backlight assembly of claim 2, wherein theat least one first deflection preventing portion comprises a pluralityof first deflection preventing portions and wherein the plurality offirst deflection preventing portions are formed to be parallel to eachother.
 10. The backlight assembly of claim 2, wherein the at least onesecond deflection preventing portion comprises a plurality of seconddeflection preventing portions and wherein the plurality of seconddeflection preventing portions are formed to be parallel to each other.11. The backlight assembly of claim 2, wherein at least one firstdeflection preventing portion comprises a plurality of first deflectionpreventing portions that are formed to extend to at least one corner oftwo corners in a direction of the second diagonal.
 12. The backlightassembly of claim 11, wherein at least one second deflection preventingportion comprises a plurality of second deflection preventing portionscrossing the second diagonal and being connected to the plurality offirst deflection preventing portions.
 13. The backlight assembly ofclaim 2, wherein at least one second deflection preventing portioncomprises a plurality of second deflection preventing portions that areformed to extend to at least one corner of two corners in a direction ofthe first diagonal.
 14. The backlight assembly of claim 13, wherein atleast one first deflection preventing portion comprises a plurality offirst deflection preventing portions crossing the first diagonal andbeing connected to the plurality of second deflection preventingportions.
 15. The backlight assembly of claim 3, wherein the number ofthe plurality of the first deflection preventing portions is 4, 6, or 8.16. The backlight assembly of claim 3, wherein the number of theplurality of the second deflection preventing portions is 4, 6, or 8.17. The backlight assembly of claim 1, wherein the at least onedeflection preventing portion forms an angle αa with respect to thediagonal of the surface of the fixing member, and the angle satisfiesthe following expression,arctan(W/L)<α<90° where W denotes the width of the surface of the fixingmember and L denotes the length of the surface of the fixing member. 18.The backlight assembly of claim 1, further comprising a reflecting sheetwhich is received to be adjacent to the surface of the fixing member,wherein the at least one deflection preventing portion is protrudedtoward the reflecting sheet.
 19. The backlight assembly of claim 1,wherein the light source includes a plurality of lamps positionedadjacent each other, and the plurality of lamps are received side byside in the fixing member.
 20. The backlight assembly of claim 1,wherein the at least one deflection preventing portion is formed bypressing the fixing member.
 21. The backlight assembly of claim 1,wherein the surface faces outside of the fixing member.